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SElEN[uM IN RAZORBACK SuCKERS IN GREEN RIVER. lJTAH 1, - -" TABLE 2 Concentrations of 61 Elements (Ilg/g Dry Weight; n = 1) Analyzed by Inductively Coupled Plasma-Mass Spectroscopy in Wild Larval Razorback Suckers (Mean Total Length 11.5 mm, Standard Error 0.04, n = 279) from Stewart Lake Drain between May 19 and June 6 in the Green River, and in Clean and Dirty Ethanol (mg/liter; n = l) Used to Store Larvae at the Larval Fish Laboratory Ethanol (mg/liter) Fish Element Illg/g) Clean Dirty Al 640 0.110 0.062 Ag 0.052 0.00002 0.00001 As 0.50 0.0000 1 0.00006 Au 0.003 0.00005 0.00002 Ba 17 0.001 0.001 Ca 10,028 0.116 0.356 Cd 4.9 0.00002 0.00043 Ce 0.56 0.00003 0.00005 Co 2.5 0.0001 0.0002 Cr 4.6 0.004 0.012 Cs 0.055 NO NO Cu 40 0.002 0.003 Er 0.011 ND NO Eu 0.011 ND NO Oy 0.033 NO ND Fe 246 0.027 0.097 Ga 0.25 0.00003 0.00002 Gd 0.044 ND NO Ge 0.011 NO ND Hf 0.033 0.00013 0.00002 Ho 0.Q11 NO NO [n NO NO NO [r NO NO NO K 260 0.Q18 0.140 La 0.30 0.00001 0.00002 Li 0.346 0.0002 0.0006 Lu NO NO NO Mg 4196 0.012 0.113 Mn 34 0.001 0.003 Mo 1.7 0.0002 0.0001 Na 662 0.897 3.610 Nb 0.044 NO 0.0000 1 Nd 0.25 NO 0.00002 Ni 5.0 0.003 0.006 Os NO NO NO Pb 3.8 0.001 0.001 Pd NO NO NO Pr 0.077 NO 0.00001 Pt 0.25 0.00003 0.00001 Rb 0.86 0.00001 0.00011 Re NO ND NO Ru ND NO NO Sc 0.011 NO NO Se 8.0 0.001 0.001 Sb 0.16 NO 0.00002 Sm 0.044 NO NO Sn 1.8 0.004 0.004 Ta NO NO NO Tb NO NO NO Te ND NO NO TABLE 2-Conrinued Ethanol (mg Iiterl Fish Element (Ilg/g) Clean Dirty Th 0.088 0.00001 00000 I Ti 33 0.001 0002 TI 0.022 NO NO Tm NO NO NO U 0.29 0.00001 0.00001 V 1.7 0.00005 0.00009 W NO 0 0 Y 0.15 0.00001 000002 Yb 0.022 NO ND Zn 299 0.008 0.029 Zr 1.1 0.006 0.001 Note. NO. not detected: value of 0.00000 resulting from TotalQuant determination (semi-quantitative analYSIS). the three samples from the same site measured by neutron activation, i.e., 5.8Ilg/g. Several elements in the ICP-MS scan seemed elevated and included cadmium, copper, lead, selenium, vanadium, and zinc. DISCUSSION Larval Abundance The larvae evaluated in the present study were taken from the 1994 collection and were most likely representative of those found in the Green River. From 1992 to 1996, 1735 razorback sucker larvae were collected from main-channel or nursery habitats of the Green River, with considerable variation between years: 20 in 1992, 292 in 1993. 1217 in 1994,32 in 1995, and 174 in 1996 (Muth er al., 1997). Of these larvae, 40% were captured in the Escalante reach, 41 % in the Jensen reach, and 20% in the Ouray reach. In the Escalante reach, over 90% of the larvae were collected at Cliff Creek. In the Jensen reach. 83% were collected at Stewart Lake Drain and 6% at Sportsman's Drain. In the Ouray reach, 85% were collected at Greasewood Corral and 14% at Old Charlie Wash inlet. In contrast, natural recruitment of larvae (::; 35 mm; Minckley and Gustafson, 1982 [based on scale rudiments and elimination of median fin membrane]) to the juvenile (;;::: 43.0 mm) life stage seems to be limited. Only 8 juveniles were collected in the Colorado River between Moab and Dead Horse Point, Utah, in 1962-1964 (Taba et aI., 1965). In the Green River, 2 juveniles were collected within Ouray NWR in 1993 (Utah Division of Wildlife Resources, unpub- lished data), 11 in Leota Bottom at Ouray NWR in 1994 (Modde and Wick, 1997),28 in Old Charlie Wash in 1995 (Modde, 1996),45 in Old Charlie Wash in 1996 (Modde, 1997), and 2 in the lower Green River near Hell Roaring Canyon in 1991 (Gutennuth et aI., 1994). Collection of juvenile razor- back suckers at Old Charlie Wash was remarkable because